利用pragma data_seg实现程序只能单个实例运行

#include <windows.h> #include <stdio.h> #include <conio.h> #pragma data_seg (".sharedata") //共享节中的共享变量必须初始化，否则编译器将其放入.bss节中，那么跨进程共享数据失败 int volatile g_iShareData = 0; #pragma data_seg() #pragma comment(linker,"/section:.sharedata,RWS") //运用预编译指令指定链接器的链接选项 // volatile关键字指定了变量可以为外部进程访问 void main() { if(g_iShareData==0) { g_iShareData++; printf("The instance run for the first time ,g_iShareData=%d!\n",g_iShareData); while(!kbhit()); } else { printf("Only one instance can run ,g_iShareData=%d,exit!\n",g_iShareData); ExitProcess(0); } }